A 103-qubit IBM experiment yields a kagome antiferromagnet energy per site of -0.417J, boundary-corrected to -0.4386J, but the Hamiltonian was engineered and the couplings were fitted to exact small-system energies.
Kandala et al., Nature 549, 242 (2017)
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Utility-Scale Quantum Computation of Ground-State Energy in a 100+ Site Planar Kagome Antiferromagnet via Hamiltonian Engineering
A 103-qubit IBM experiment yields a kagome antiferromagnet energy per site of -0.417J, boundary-corrected to -0.4386J, but the Hamiltonian was engineered and the couplings were fitted to exact small-system energies.